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// SPDX-License-Identifier: GPL-2.0
/*
* driver for mmio TCG/TIS TPM (trusted platform module).
*
* Specifications at www.trustedcomputinggroup.org
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <tpm-v2.h>
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/io.h>
#include <linux/unaligned/be_byteshift.h>
#include "tpm_tis.h"
#include "tpm_internal.h"
/**
* struct tpm_tis_chip_data - Information about an MMIO TPM
* @pcr_count: Number of PCR per bank
* @pcr_select_min: Minimum size in bytes of the pcrSelect array
* @iobase: Base address
*/
struct tpm_tis_chip_data {
unsigned int pcr_count;
unsigned int pcr_select_min;
void __iomem *iobase;
};
static int mmio_read_bytes(struct udevice *dev, u32 addr, u16 len,
u8 *result)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
while (len--)
*result++ = ioread8(drv_data->iobase + addr);
return 0;
}
static int mmio_write_bytes(struct udevice *dev, u32 addr, u16 len,
const u8 *value)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
while (len--)
iowrite8(*value++, drv_data->iobase + addr);
return 0;
}
static int mmio_read32(struct udevice *dev, u32 addr, u32 *result)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
*result = ioread32(drv_data->iobase + addr);
return 0;
}
static int mmio_write32(struct udevice *dev, u32 addr, u32 value)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
iowrite32(value, drv_data->iobase + addr);
return 0;
}
static struct tpm_tis_phy_ops phy_ops = {
.read_bytes = mmio_read_bytes,
.write_bytes = mmio_write_bytes,
.read32 = mmio_read32,
.write32 = mmio_write32,
};
static int tpm_tis_probe(struct udevice *dev)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
int ret = 0;
fdt_addr_t ioaddr;
u64 sz;
ioaddr = dev_read_addr(dev);
if (ioaddr == FDT_ADDR_T_NONE)
return log_msg_ret("ioaddr", -EINVAL);
ret = dev_read_u64(dev, "reg", &sz);
if (ret)
return -EINVAL;
drv_data->iobase = ioremap(ioaddr, sz);
tpm_tis_ops_register(dev, &phy_ops);
ret = tpm_tis_init(dev);
if (ret)
goto iounmap;
priv->pcr_count = drv_data->pcr_count;
priv->pcr_select_min = drv_data->pcr_select_min;
/*
* Although the driver probably works with a TPMv1 our Kconfig
* limits the driver to TPMv2 only
*/
priv->version = TPM_V2;
return ret;
iounmap:
iounmap(drv_data->iobase);
return -EINVAL;
}
static int tpm_tis_remove(struct udevice *dev)
{
struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
int ret;
ret = tpm_tis_cleanup(dev);
iounmap(drv_data->iobase);
return ret;
}
static const struct tpm_ops tpm_tis_ops = {
.open = tpm_tis_open,
.close = tpm_tis_close,
.get_desc = tpm_tis_get_desc,
.send = tpm_tis_send,
.recv = tpm_tis_recv,
.cleanup = tpm_tis_cleanup,
};
static const struct tpm_tis_chip_data tpm_tis_std_chip_data = {
.pcr_count = 24,
.pcr_select_min = 3,
};
static const struct udevice_id tpm_tis_ids[] = {
{
.compatible = "tcg,tpm-tis-mmio",
.data = (ulong)&tpm_tis_std_chip_data,
},
{ }
};
U_BOOT_DRIVER(tpm_tis_mmio) = {
.name = "tpm_tis_mmio",
.id = UCLASS_TPM,
.of_match = tpm_tis_ids,
.ops = &tpm_tis_ops,
.probe = tpm_tis_probe,
.remove = tpm_tis_remove,
.priv_auto = sizeof(struct tpm_chip),
};
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